Instructions / Assembly

49
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T
ensile Strength 0.2% Yield Strength Elong. R.A. Hardness
T
ype Condition ksi MPa ksi MPa % % Rockwell
Precipitation Hardening Types
Ph13-8 Mo H950 220 1517 205 1413 8 45 C45
15-5PH H900 190 1310 170 1172 10 35 C44
15-5PH H1150 135 931 105 724 16 50 C32
17-4PH Sol. Ann. 150 1034 110 758 10 45 C33
17-4PH H900 200 1379 178 1227 12 48 C44
1
7-7PH Sol. Ann. 130 896 40 276 35 B85
1
7-7PH RH950 235 1620 220 1517 6 C48
P
H15-7 Mo Sol. Ann. 130 896 55 379 35 B88
P
H15-7 Mo RH950 240 1655 225 1551 6 25 C48
1
7-10P Sol. Ann. 89 613 37 255 70 76 B82
1
7-10P H1300 143 986 98 676 20 32 C32
A
286 H1350 130 896 85 586 15
A
M350 Sol. Ann. 160 1103 55 379 40 B95
A
M350 DA 195 1344 155 1069 10.5 C41
A
M355 S
ol. Ann. 175 1207 65 448 30 B95
AM355 DA 195 1344 155 1069 10 C41
Custom 450 Anneal 125 862 95 655 10 40 C30
Custom 450
H900 180 1241 170 1172 10 40 C40
Custom 455 H900 235 1620 220 1517 8 30 C47
Stainless W Sol. Ann. 120 827 75 517 7 C30
Stainless W H950 195 1344 180 1241 7 25 C46
Duplex Types
2
205 120 827 65 448 25
2304 1
10 758 6
0 414 2
5
255 110 758 80 552 15
2507 116 800 80 550 15
Selection of a Stainless Steel
The selection of a particular type stainless steel will depend on
what is required by the application. In most cases the primary
consideration is corrosion resistance, tarnish resistance or
oxidation resistance at elevated temperature. In addition to
these requirements, the selected stainless steel must have some
minimum mechanical properties such as strength, toughness,
ductility and fatigue strength. Several types and grades of
stainless steel may provide the corrosion resistance and
mechanical properties required. In this case, the final selection
should be made on the basis of the lowest cost available alloy
which will fulfill the service requirements. Generally, selection of
the type of stainless steel is made by the designer of the equip-
ment or component based on his knowledge, experience and
data on corrosion behavior of various alloys in the environment
of interest. The responsibility of the welding engineer normally
does not include selection of the base alloy, only selection of the
filler material, welding process and welding procedure.
If it becomes necessary for the welding engineer to select a
base alloy, information should be gathered on the service
environment, expected life of the part and extent of corrosion
which is acceptable. To assist in this selection, Table 16, on
page 50, lists corrosion resistance of several standard types of
stainless steel to a number of corrosive media. This indicates
that austenitic types and higher chromium types generally are
more corrosion resistant than the martensitic and lower
chromium ferritic types. A great deal of test data has been
generated on the corrosion behavior of many metals and alloys
in many kinds of corrosive media.
Other factors which must be considered in selecting a stainless
steel are resistance to pitting, crevice corrosion and intergranular
attack. Intergranular attack is caused by carbide precipitation in
weld heat affected zones and methods of preventing this
problem were discussed previously. If the application involves
service at elevated temperature, then elevated temperature
mechanical properties such as creep strength, stress rupture
strength and oxidation resistance must be considered.
With the corrosion and oxidation test data derived from the
handbooks and other references, a stainless steel or other alloy
may be selected for a particular application. Once the stainless
steel is selected, it is the welding engineer’s responsibility to
design the joints, select the weld filler metal, welding process
and welding procedure.
From ASM Metals Handbook, 8th Edition, Volume 1; and 9th Edition, Volume 3
NOMINAL MECHANICAL PROPERTIES
TABLE 15 — Nominal Mechanical Properties of Precipitation Hardening and Duplex Stainless Steels